Eventually the last "why" you get to has the answer: "The biological machinery that comprises my body receives incoming stimuli and the laws of physics causes a cascading chain reaction which changes my internal state. Thus, I'm basically a series of recursive analog state machines and free will is but an illusion." At that point, you lose all motivation for asking any further "why" questions.
Last I checked, the free will question wasn't shut, and I wouldn't suggest basing your entire model of the world on something that pretty much nobody has a good understanding of right now. O.o
It sounds like you've simply bought modern "nihilism", i.e., the "everything is meaningless and nothing matters" philosophy that a lot of logical types seem to believe but none actually live (since it's not workable).
Digging down to whys requires actually answering them, not throwing your arms in the air and saying that the question is unanswerable. It's answerable, there's a reason that you do things, otherwise you wouldn't even be able to exist. "I do things because that's what my machinery does" is avoiding the question. Well, duh. That doesn't mean there aren't reasons as to why you do or do not eat that donut.
It's like if someone approached you asking how a given piece of software works, and instead of explaining the structure and the business logic, you say that it's a bunch of machine code. Wrong level of abstraction, you just dodged the question.
Oh, I'm not saying that I live under a nihilist viewpoint. Even if free will is little more than an illusion masked by seemingly infinite complexity, I happily buy into the illusion and (for the most part) operate as if I have unlimited agency / free will. My comment was more to say that you have to stop asking "why" at some point and just go with the flow otherwise you descend into meaningless.
> I [...] operate as if I have unlimited agency / free will.
That's a different sort of trap, as it ignores the effects of circumstance (even minor things, like whether organ donation is an opt-in or opt-out checkbox can have huge real-world effects).
It also leads to blaming the unfortunate for making poor choices when those choices have been both constrained and biased by circumstance.
I mean... but you do. You just said that if you keep asking, you end up with a "nihilist" view and descend into meaningless. So your overall philosophy right now is that form of "nihilism". That is, after all, why you do not find the value in asking "why".
I strongly disagree with that and I believe this kind of thinking is not actually as logical or as rational as you were lead to believe, and properly asking the why question and answering it is fairly critical to figuring out what should be done.
> go with the flow
Go with whose flow? You realize that this is just you piggybacking on someone else's answer to the "why" and blindly accepting it without any kind of verification? This should be alarming, not calming.
Really, if someone somewhere was able to answer this question well enough that they could create a "flow" for you to go with, you can do the same.
It's the path of least resistance, that's why people do it, there isn't some greater "point" to it. But it leaves you at the mercy of someone else. Choose the someone else carefully, as I haven't really seen good candidates lately...
